JP2003087503A - Solid-state image pickup device and image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize satisfactory reading about both a color image and a monochrome image while enabling color image reading with high definition and fast monochrome image reading. SOLUTION: An image pickup device 10 is configured so as to be provided with first reading means 11 to 13 of reading an optical image about a plurality of color components to image a color image, and a second reading means 14 for reading an optical image about any one color component to which the first reading means 11 to 13 correspond in addition to the first reading means 11 to 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state image pickup device and an image reading device, and more particularly to a solid-state image pickup device and an image reading device used for optically reading an image drawn on a document to be read.

[0002]

2. Description of the Related Art In recent years, as an image reading device used in a copying machine, a scanner device, or the like, a device capable of reading a color image has become widespread. In such an image reading device, a solid-state image sensor having a CCD (Charge Coupled Device) sensor having a three-line structure corresponding to each color component of R (red), G (green), and B (blue) which are three primary colors of light is usually used. An image is read using an imaging device. Therefore, even when a black-and-white image is drawn on the original to be read, the image reading apparatus generates black-and-white image data based on the output signal of each color component from the solid-state imaging device having a three-line configuration. Will be generated.

However, when an image on an original is read by an image reading apparatus, high-quality read image quality is required for color images, whereas high-speed reading is often required for monochrome images. From this,
Recently, as a solid-state imaging device used in an image reading device, in addition to a CCD sensor for three lines corresponding to each color component of RGB, a CC for one line for reading a monochrome image is provided.
A 4-line configuration having a D sensor is being used.

In such a 4-line solid-state image pickup device, for example, by increasing the output of only one line for black and white by adding a transfer register or the like, it is possible to realize high speed reading of a black and white image. . Moreover, since it is not necessary to increase the number of outputs for all the lines, it is possible to suppress the cost increase of the image reading device due to the complication of the solid-state imaging device, the signal processing circuit of the subsequent stage, and the like as much as possible. From these, it can be said that the 4-line solid-state imaging device is very suitable for use in an image reading device that can read both color images and monochrome images.

[0005]

However, in the conventional 4-line solid-state image pickup device, only one line for black and white is different from the other three lines, and the color filter for color components such as R, G or B is used. Instead, it reads the optical image from the original. Therefore, the conventional solid-state imaging device having a four-line structure and the image reading device using the same may have the following problems.

For example, in the conventional 4-line solid-state image pickup device, one line for black and white has no color filter, so that the sensor sensitivity of the one line is higher than that of the other three lines. turn into. That is, with the same illumination, the output of only one line for black and white may be saturated. However, in order to avoid this, if the light quantity of the illumination is lowered, the other 3
It is conceivable that the amount of light with respect to the line becomes insufficient, and as a result, the SN (signal-to-noise) of the RGB output deteriorates. That is, even if the image reading apparatus is configured by using the conventional solid-state imaging device having a 4-line structure, it is not always possible to easily realize good reading of both a monochrome image and a color image.

[0007] In general, many black-and-white image reading apparatuses that do not read black-and-white images (those that do not read color images) use a green light source instead of a white light source for illumination. This is because when a white light source is used, a filter for cutting the invisible region (infrared light, ultraviolet light, etc.) is required, whereas the green light source does not have sensitivity in the invisible region, so the filter is This is because it becomes unnecessary and the cost can be reduced accordingly. However, in an image reading apparatus using a conventional solid-state image pickup device having a four-line structure, if a green light source is used, a color image cannot be read well, so it is necessary to use a white light source. Therefore, compared with an image reading device dedicated to black and white, it is conceivable that a difference occurs in image reading characteristics particularly when a document on which a color image is drawn is read as a black and white image. Therefore, it cannot be said that a conventional image reading apparatus using a 4-line solid-state imaging device can always realize good reading characteristics even though it can speed up reading of a monochrome image.

Therefore, the present invention provides a solid-state image pickup device and an image reading device which enable high-quality reading of a color image and high-speed reading of a black-and-white image while realizing good reading of both of them. The purpose is to

[0009]

DISCLOSURE OF THE INVENTION The present invention is a solid-state image pickup device devised to achieve the above object, and a first image reading method for a plurality of color components for picking up a color image is performed. It is characterized by further comprising: a reading unit and a second reading unit, which is separate from the first reading unit and which reads an optical image for any one of the color components corresponding to the first reading unit. It is a thing.

The present invention is also an image reading device devised to achieve the above object, and a first reading means for reading an optical image for a plurality of color components for picking up a color image, In addition to the first reading unit, a second reading unit that reads an optical image of any one of the color components corresponding to the first reading unit is provided, and the first reading unit reads the first image when reading a color image. The reading result by the reading unit is used, and the reading result by the second reading unit is used at the time of reading a monochrome image.

According to the solid-state image pickup device having the above structure and the image reading device having the above structure, the first reading unit is, for example, RGB.
While the optical image is read for a plurality of color components, the second reading means reads the optical image for one of the color components (for example, G component). The sensitivity of the reading means will not be extremely higher than the sensitivity of the first reading means. Also, the second reading means is, for example, G
When the optical image of the component is read, the reading characteristic of the image is not different from that when the green light source is used.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A solid-state image pickup device and an image reading device according to the present invention will be described below with reference to the drawings.

First, a schematic structure of the image reading apparatus will be described. FIG. 1 is a side sectional view showing an example of a schematic configuration of an image reading apparatus according to the present invention.

The image reading apparatus 1 described in this embodiment is
It is used in a copying machine, a scanner device, a facsimile device, and the like, and optically reads an image drawn on a sheet-shaped document to be read. Therefore, the image reading apparatus 1 has the platen glass 2 on which the document to be read is placed.

Below the platen glass 2, a first carriage (hereinafter, the carriage is referred to as “CRG”) 3 and a second CRG 4 functioning as a scanning unit are arranged. The first CRG 3 is equipped with an illumination lamp 3a that illuminates a document placed on the platen glass 2 and a first mirror 3b that changes the optical axis direction of the reflected light from the document obtained by the illumination. In addition, from the illumination lamp 3a,
It shall be illuminated with white light. Also, the second CRG4
Is equipped with a second mirror 4a and a third mirror 4b that change the optical axis direction of the reflected light from the first mirror 3b.

These first CRG3 and second CRG4
Are movable along the platen glass 2 in the sub-scanning direction (direction of arrow A in the figure). However, these move in the same direction in conjunction with each other. At that time, the second CRG 4 moves at a speed half that of the first CRG 3 so that the distance between the original on the platen glass 2 and a solid-state imaging device described later is always kept constant. The movement of the first CRG 3 and the second CRG 4 is performed by operating a drive source such as a pulse motor (not shown).

Below the platen glass 2, a lens 5 for condensing the reflected light from the original that has passed through the first CRG 3 and the second CRG 4 at a predetermined focal position, and a reflection after the condensing at the focal position. A solid-state imaging device 10 that receives light and converts the light into an electric signal, and an image processing board 20 that performs predetermined signal processing on an output signal obtained by photoelectric conversion in the solid-state imaging device 10 are arranged. It is set up. The solid-state imaging device 10 has a CCD sensor for four lines, which will be described in detail later, in order to read both color images and monochrome images.

On the other hand, above the platen glass 2, an automatic document feeder (hereinafter referred to as "ADF") which covers the platen glass 2 in an openable and closable manner.
6 are provided.

The ADF 6 includes a document setting section 7 on which a document to be read is stacked, a document discharging section 8 for discharging the read document, and a document set on the document setting section 7 for the document setting section 7. And a document transport mechanism 9 for transporting the document to the document discharge section 8 via the platen glass 2. The ADF 6 may be a so-called DADF (Duplex ADF) having a document reversing function.

In the image reading apparatus 1 having the above-described structure, when the original is placed on the platen glass 2, the first CRG 3 and the second CRG 4 move at a constant speed along the platen glass 2. , The original on the platen glass 2 is scanned. As a result of this scanning, the solid-state imaging device 10
The platen glass 2, the respective mirrors 3a, 4a, 4b mounted on the first CRG 3 and the second CRG 4, and the lens 5
An image corresponding to the so-called platen scan method is read from the original on the platen glass 2 via the.

When a document is set in the document setting section 7 of the ADF 6, the document feeding mechanism 9 sequentially feeds the document one by one and feeds it onto the platen glass 2. Then, when the conveyed document is positioned on the platen glass 2, the document is scanned similarly to the case described above to read the image, and the document after the image reading is discharged to the document discharge unit 8. By repeating this, the solid-state imaging device 10 continuously reads an image from each document set in the document setting section 7. However, when a document is set on the document setting unit 7, the ADF 6 is configured such that the document to be read is at a constant speed on the predetermined position while the first CRG 3 and the second CRG 4 are stationary at the predetermined position. The original may be conveyed so as to pass through. By this conveyance, the solid-state imaging device 10 reads an image while moving a document to be read, that is, a so-called CVT (Co
nstant Velocity Transfer) method will be used for image reading.

Next, the solid-state image pickup device 10 for reading the image as described above will be described in detail. FIG. 2 is a block diagram showing an outline of an example of the solid-state imaging device according to the present invention.
FIG. 3 is a block diagram showing the functional configuration of the solid-state imaging device.

As shown in FIG. 2, the solid-state image pickup device 10 described here includes CCD line sensors 11 to 14 in which n photodiodes (pixels) each having a size of 10 μm × 10 μm are linearly arranged. It is equipped with four lines. That is, the solid-state imaging device 10 has four
The pixel columns 11 to 14 having a line configuration are provided. It should be noted that the arrangement intervals of the pixel columns 11 to 14 may be, for example, four lines in the sub-scanning direction, for the sake of ease of signal processing (gap correction and the like) described later, but the arrangement intervals are not necessarily limited to this. Instead, it may be appropriately determined in consideration of the overall configuration of the image reading device 1.

Color filters corresponding to the respective color components of RGB are separately provided on the three pixel columns 11 to 13 out of the pixel columns 11 to 14 having the four-line structure. That is, these pixel rows 11 to 13 read an optical image for each of the RGB color components for picking up a color image, and function as the first reading unit in the present invention. In addition, a color filter corresponding to the G color component is provided on the other one pixel row 14, as in the pixel row 12. That is, the pixel row 14 reads an optical image for one color component of the three pixel rows 11 to 13 described above, and functions as the second reading unit in the present invention. .

By the way, in the solid-state image pickup device 10, as shown in FIG. 3, one transfer register 11a to 13a is provided for each of the three pixel columns 11 to 13 corresponding to the RGB color components. , The other one pixel column 14 is provided with two transfer registers 14a and 14b on both sides thereof, and the odd-numbered (ODD) pixel and the even-numbered (EVEN) pixel are sorted by these and output in parallel. Is ready to go.

In the solid-state image pickup device 10, as will be described later, an SH signal, φ1 and φ2 pulse signals, and
The LH signal, the RS signal, and the SW1 signal are input as necessary. Further, regarding the output signal which is the result of the image reading, the output terminals VO1, VO2 and VO3
It is designed to output from the outside.

In the solid-state image pickup device 10 having the above-described structure, when the reflected light from the document enters, the pixel columns 11 to 1
Each pixel in 4 accumulates electric charges according to the amount of received light. After that, the charge accumulated in each pixel is transferred to the corresponding transfer register 11 by the SH signal which is a shift pulse given from the outside at a predetermined timing.
Move to a-14b. Then, the moved charges are sequentially transferred in the transfer registers 11a to 14b by pulse signals of φ1 and φ2 which are clock pulses from the outside, and output terminals VO1 and V1 by the LH signal which is a final transfer pulse.
Transferred to O2 and VO3, and output terminals VO1 and VO
2, VO3 is output to the outside as an output signal.

At this time, for the pixel row 14, the other three
Unlike the one pixel columns 11 to 13, two transfer registers 14a and 14b can output ODD and EVEN in parallel. Therefore, the charges accumulated in the pixel column 14 can be read out at a speed twice that of the other three lines.

When outputting the output signal to the outside,
Since the switch 15 that operates according to the SW1 signal from the outside is provided between the transfer registers 12a, 13a, 14a, 14b and the output terminals VO1 and VO2, the SW1 signal is used to output signals from the output terminals VO1 and VO2. You can select the output. Specifically, the charges transferred by the two transfer registers 14 a and 14 b corresponding to the pixel column 14 and the transfer registers 1 corresponding to the pixel columns 12 and 13
It is possible to selectively output either of the charges transferred by 2a and 13a from the output terminals VO1 and VO2.

It should be noted that the output terminals VO1, VO2, and VO are output by using the charges from the transfer registers 11a to 14b as output signals.
After the output from 3, the RS signal from the outside resets the electric charge after the output.

Next, the image processing board 20 that performs predetermined signal processing on the output signal from the solid-state image pickup device 10 as described above will be described in detail. FIG. 4 is a block diagram showing the functional arrangement of an example of the image processing board provided in the image reading apparatus according to the present invention.

As shown in the figure, the output terminals VO1 and VO1 of the solid-state image pickup device 10 are provided on the image processing board 20 described here.
A sample hold circuit 21, an amplifier circuit 22, and an A / D conversion circuit 23 are provided corresponding to each of VO2 and VO3. These are all solid-state imaging device 1
The analog output signal obtained at 0 is subjected to analog signal processing such as sample hold and level amplification, or subjected to A / D conversion processing into a digital signal.

Then, in the subsequent stage of the A / D conversion circuit 23,
The combining circuit 24 is provided so as to correspond to only the output terminals VO1 and VO2. In the synthesizing circuit 24, the charges transferred by the two transfer registers 14a and 14b corresponding to the pixel column 14 are output signals as output signals VO1 and VO2.
When output from, combine these output signals,
The ODD and the EVEN are arranged alternately.

Further, in the subsequent stage of the A / D conversion circuit 23, in addition to the synthesis circuit 24, output terminals VO1, VO2 and VO3 are provided.
A shading correction circuit 25 for performing shading correction processing is provided for each of the above.
Further, a look-up table (hereinafter referred to as “LUT”) 27 and a color space conversion circuit 28 are provided in the subsequent stage of these shading correction circuits 25 via a delay circuit 26 provided corresponding to only the output terminals VO1 and VO2. Is provided. Of these, the delay circuit 26 includes the pixel columns 11 to 11.
The LUT 27 and the color space conversion circuit 28 convert the output signal from the solid-state imaging device 10 into a combination of a lightness signal and a chromaticity signal. The shading correction circuit 25 and the LUT 27 are also provided in the subsequent stage of the synthesis circuit 24.

Next, the processing operation in the solid-state imaging device 10 and the image processing board 20 when the image reading apparatus 1 reads an image using the solid-state imaging device 10 and the image processing board 20 described above will be described. . Here, a case of a color mode for reading an image on a document as a color image and a case of a monochrome mode for reading an image on a document as a monochrome image will be described as examples.

For example, in the case of the color mode, the charge from the transfer registers 12a and 13a is output to the output terminal VO1 by the SW1 signal supplied to the solid-state image pickup device 10.
Output by VO2 is selected. As a result, from the output terminals VO1, VO2, VO3 of the solid-state imaging device 10, three pixel columns 11 to 1 corresponding to RGB color components are formed.
The charges accumulated in 3 are output as output signals.

These output signals are sent to the sample hold circuit 21 and the amplifier circuit 2 on the image processing board 20.
After analog signal processing in 2, the A / D conversion circuit 23 converts the signal into a digital signal, and then the shading correction circuit 25 performs shading correction processing. After that, the digital signal from the output terminals VO1 and VO2, for example, the pixel row 1 located on the upstream side in the scanning direction of the R color and the G color
For digital signals from 2 and 13, the pixel column 1
It is delayed by the distance between pixels 2 and 13 and the pixel column 11. As a result, the reading positions for the RGB color components are aligned.

After the reading position is adjusted, the LUT 27 is based on the digital signals corresponding to the RGB color components.
And the color space conversion circuit 28 generates a lightness signal and a chromaticity signal representing a color image, and these are generated.
It is output to a processing circuit in the subsequent stage (not shown) or the outside of the image reading apparatus 1. The lightness signal and chromaticity signal output at this time may be based on the L ^* a ^* b ^* color system, for example.

On the other hand, in the case of, for example, the monochrome mode, the SW1 signal supplied to the solid-state image pickup device 10 selects to output the charges from the transfer registers 14a and 14b to the output terminals VO1 and VO2. As a result, the output terminals VO1, VO2, V of the solid-state imaging device 10 are
From O3, the charges accumulated in the pixel column 11 corresponding to each R color component and the charges of ODD and EVEN accumulated in the pixel column 14 are output as output signals, respectively.

However, in the monochrome mode, the charges accumulated in the pixel column 11 are not required in the subsequent processing operation. Therefore, the output signal from the output terminal VO3 may be handled in any way after it is received by the image processing board 20.

On the other hand, the output signals from the output terminals VO1 and VO2 are subjected to analog signal processing in the sample hold circuit 21 and the amplifier circuit 22 on the image processing board 20, and then are digital signals in the A / D conversion circuit 23. After being converted to, the synthesis circuit 24 synthesizes. As a result, the output signals from the output terminals VO1 and VO2, that is, the charges from the two transfer registers 14a and 14b are transferred to ODD and EV.
EN and EN will be combined alternately.

After the combination of ODD and EVEN, the output signal after the combination is sent to the LUT 27 through the shading correction processing in the shading correction circuit 25, and the LU
At T27, it is converted into a lightness signal representing a monochrome image. Then, the brightness signal is output to the outside of the processing circuit (not shown) in the subsequent stage of the image processing board 20 or the image reading device 1.

As described above, in the solid-state image pickup device 10 and the image reading device 1 of this embodiment, in the case of the color mode, three pixel columns corresponding to the RGB color components and functioning as the first reading means. While an optical image is read using 11 to 13, another pixel row 1 that functions as a second reading unit in the monochrome mode is used.
4 is used to read an optical image. A color filter corresponding to one color component of the three pixel columns 11 to 13, specifically, the same G color component as the pixel column 12 is provided in the one pixel column 14. There is.

Therefore, the solid-state imaging device 1 of this embodiment
0 and the image reading apparatus 1, the pixel array 14 reads an optical image through the color filter corresponding to the G color component, and therefore the sensor sensitivities of the pixel array 14 and the pixel arrays 11 to 13 greatly differ. It will not be lost. That is, unlike the case of using the conventional solid-state imaging device having a 4-line configuration, the exposure cycle of each pixel row 11 to 14 and the light amount of the illumination lamp 3a are taken into consideration without considering the output saturation of the pixel row 14 for black and white. Since it can be set, it is possible to obtain a large RGB output from the color pixel columns 11 to 13, and as a result, it is possible to prevent the SN of the RGB output from deteriorating. Therefore, it can be said that good reading can be realized for both a monochrome image and a color image.

Further, according to the solid-state image pickup device 10 and the image reading device 1 of this embodiment, since the pixel array 14 reads the optical image through the color filter corresponding to the G color component, the color image is read. Even if the illumination lamp 3a is a white light source for good performance, it is possible to realize a black-and-white image reading characteristic substantially similar to that of a black-and-white image reading apparatus using a green light source. That is, it can be said that good reading characteristics can be realized even for a monochrome image.

By the way, the solid-state imaging device 10 of the present embodiment.
In the image reading apparatus 1, the pixel columns 11 to 1 for color are used.
The pixel row 14 reads the optical image through the color filter corresponding to the G color component, which is one of the three color components. It is known that the G color component has the widest spectral characteristic region among the RGB color components to which the pixel columns 11 to 13 correspond. Therefore, in the black-and-white mode, since the optical image is read while corresponding to the wide spectral characteristic region, the improvement of the reading characteristic can be ensured. Specifically, for example, even when a document on which a color image is drawn is read as a black-and-white image, the region of the spectral characteristics of the G color component is the widest, and almost all wavelengths in the visible light region (400 to 700).
Since it has a sensitivity of about (nm), the original image can be satisfactorily read as a monochrome image.

It is known that the G color component is the color component having the largest output signal among the RGB color components to which the pixel columns 11 to 13 correspond. Therefore, in the black and white mode, the optical image is read while corresponding to the large color component of the wide output signal, so that a good SN ratio can be realized, which also ensures the improvement of the reading characteristics. Can be

From these facts, in the solid-state image pickup device 10 and the image reading device 1 of this embodiment, the pixel array 1 for black and white is used.
4 reads an optical image through a color filter corresponding to the G color component, thereby enabling high-quality reading of a color image and high-speed reading of a black-and-white image, and realizing good reading of both of them. Will be able to.

However, the color components to which the pixel array 14 corresponds are
For the reason described above, the G color component is most preferable among the RGB color components, but the present invention is not necessarily limited to this. For example, the black and white pixel array may correspond to other color components (R color component or B color component), and even in that case, the difference in sensor sensitivity between color and black and white is improved. It is possible to suppress SN deterioration of RGB output. In addition, even when a plurality of pixel columns provided for color correspond to the respective color components of RGB + α or completely correspond to other color components, in the case of the present embodiment described above. By applying the present invention in exactly the same manner as described above, it is considered that excellent reading can be realized for both color images and monochrome images.

Although the present embodiment has been described with reference to a preferred specific example for carrying out the present invention, the present invention is not limited to this, and various modifications can be made. Also, the same effect as that of this embodiment can be obtained. For example, the solid-state imaging device for reading an optical image may be configured as described below, unlike the example described in the present embodiment. 5 and 6 show
It is a block diagram which shows the function structure of the other example of the solid-state imaging device which concerns on this invention.

The solid-state image pickup device shown in FIG. 5 has an output terminal VO.
1, VO2, VO3, output terminals VO4, VO5, and transfer registers 1 attached to the respective pixel columns 11-14.
In this example, the electric charges from 1a to 14b are all output to the outside as they are. Even with such a configuration, excellent reading can be realized for both color images and monochrome images. Further, in this solid-state image pickup device, the sample hold circuit 21, on the image processing substrate 20, corresponding to each of the output terminals VO1 to VO5,
Although it is necessary to provide the amplifier circuit 22 and the A / D conversion circuit 23 in a duplicated manner, the switch 15 for selectively outputting electric charges and the SW1 signal from the outside are unnecessary, and the pixel columns 11 to 14 for four lines are unnecessary. It becomes possible to simultaneously output the output signals from the image processing board 20 to the image processing board 20.

The solid-state image pickup device shown in FIG. 6 has two transfer registers 11a, 11b, 12a, 12b and 13 for the three color pixel columns 11 to 13, respectively.
In this example, a and 13b are provided, and four transfer registers 14a to 14b are provided for one pixel row 14 for black and white. In the case of such a configuration, as compared with the case of the above-described embodiment (see FIG. 3), each pixel column 1
Since the transfer registers for 1 to 14 have been doubled,
In both the color mode and the black-and-white mode, good reading can be realized, and the reading speed can be further increased.

As described above, the present invention can be applied to various structures as long as the pixel arrays for color and the monochrome are provided separately.

[0054]

As described above, according to the solid-state image pickup device and the image reading device of the present invention, the first reading means reads an optical image for a plurality of color components such as RGB. Since the second reading means reads the optical image for one of the color components (for example, the G component), the first reading means is used for the color image and the second reading means is used for the monochrome image. If it is used, it is possible to realize high-quality reading of a color image and high-speed reading of a monochrome image, and at the same time, to realize excellent reading of both of them.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an example of a schematic configuration of an image reading apparatus according to the present invention.

FIG. 2 is a configuration diagram showing an outline of an example of a solid-state imaging device according to the present invention.

FIG. 3 is a block diagram showing a functional configuration of an example of a solid-state imaging device according to the present invention.

FIG. 4 is a block diagram showing a functional configuration of an example of an image processing board included in the image reading apparatus according to the present invention.

FIG. 5 is a block diagram (No. 1) showing a functional configuration of another example of the solid-state imaging device according to the present invention.

FIG. 6 is a block diagram (No. 2) showing the functional configuration of another example of the solid-state imaging device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Image reading device, 3a ... Illumination lamp, 10 ... Solid-state imaging device, 11, 12, 13, 14 ... Pixel column, 11a, 11
b, 12a, 12b, 13a, 13b, 14a, 14
b, 14c, 14d ... Transfer register, 20 ... Image processing board

Continued front page    F-term (reference) 4M118 AA02 AA10 AB01 BA11 CA02                       DB06 FA08 GA03 GC08 GD03                 5B047 AB04 BB03 BC01                 5C051 AA01 DA03 DA06 DB01 DB12                       DB15 DB18 DB23 DC02 DC07                       EA01 FA01                 5C072 AA01 BA03 CA02 DA09 EA05                       FA07 QA10 UA02 UA11 XA01

Claims (8)

[Claims] 1. A first reading means for reading an optical image for a plurality of color components for capturing a color image; and a first reading means corresponding to the first reading means separately from the first reading means. A solid-state imaging device comprising: a second reading unit that reads an optical image for any one of the color components. 2. The solid according to claim 1, wherein the second reading unit corresponds to a color component having a widest spectral characteristic region in correspondence with the first reading unit. Imaging device. 3. The solid-state imaging device according to claim 1, wherein the second reading unit corresponds to the color component having the largest output signal among the first reading unit. . 4. The second reading means corresponds to a green component of the red, green and blue color components when the first reading means corresponds to each of the red, green and blue color components. The solid-state imaging device according to claim 1. 5. A first reading means for reading an optical image for a plurality of color components for picking up a color image; and a first reading means corresponding to the first reading means separately from the first reading means. A second reading means for reading an optical image for any one of the color components, wherein the reading result by the first reading means is used when reading a color image, and the second reading means is used when reading a monochrome image. An image reading apparatus configured to use a reading result from the image reading apparatus. 6. The image according to claim 5, wherein the second reading unit corresponds to a color component having a widest spectral characteristic region in correspondence with the first reading unit. Reader. 7. The image reading apparatus according to claim 5, wherein the second reading unit corresponds to a color component having the largest output signal among the first reading unit. . 8. The second reading means corresponds to a green component of the red reading means, when the first reading means corresponds to red, green and blue color components, respectively. The image reading device according to claim 5.